Nut-lock.



ROBERT .'BIXIBY, OF NORTH ANDOVER, MASSACHUSETTS.

'NUT-LO CK.

Speccation of Letters Patent.

Patented oct. 2s, rais.

Application led December 27, 1912. l Serial No. 738,875.

To al? 'whom may concern Be it known that I, ROBERT BIXBY, a citizen of the United States, residing at North Andover, in the county of Essex and State of Massachusetts, have invented new and useful Improvements in Nut-Locks, of which the following is a specification.

This invention relates to nut locks and` the principal'ohject ot the invention is to provide a simple and efficient device of this character which will have no more weight or take up any more room than the ordina nut and washer and which will not be destroyed or damaged in any manner when backed ol' the bolt.

A further object of the invention is to provide a device of this character which does not require any special machine bolt and with which it is not necessary to use a washer.

Further objects of this invention will appear as the following specific description is readin connection with the accompanying. drawing. which forms a part of this application. and in which c* Figure l is a sectional view. Fig. 2 is a transverse .section on the line 2-2 of Fig'. l.v Fig. 3 is an elevation of a combined collar and washer. Fig. l is a detail sectional view of the nut.

Referring,r more particularly to the drawing, l and 2 represent the two parts to be connected together. the parts having alined openings 3 through which an ordinary machine holt 4 is passed. The threads on this holt preterahlv have a pitch of about eight to an inch. Threaded on the holt is a collarI 'It' having external screw threads 5 runningy in an opposite direction to the threads on i the bolt and having a pitch ot' approximately thirteen to an inch. Thisl collar integrally formed with an annular flange 6 which forms a washer and which is (lished upon its under side, as shown at 7. The nut is shown at S and is provided with the central here internally threaded to receive the threads 5 ol' the collar 4. It is also provided with a reduced bore internally threaded to receive the threads ot' the bolt.

In operating the device, the nut 8 is threaded upon the collar and turned down thereon with considerable force. The collar and nut are then threaded to receive the bolt, and in this manner, the

he nut is applied to manner and it' the parts bled with suilicient force prior to placing.;- the nut upon the bolt, the washer will engage the parts to be clamped with suliicient force to clamp these parts together before the part 8 begins to turn upon the part 4:. AS the part 8 turns independently of the collar at', these parts will be separated to a certain extent owing to the fact that the threads 5 are left hand threads, while the threads on the bolt are right hand threads and by turning the part 8 to screw the same down upon the bolt :an action is obtained which tends to unscrew the part 8 from the part 4. At this time, the (lished face of the washer 6 comes into play, for as the parts are separated, the part el will he forced tighter into eng-agement with the part to be clamped and the periphery ot the washer will give suhcienlly to accommodate this separation and will flatten itself out upon the part being clamped. 'lhc retrograde movement of the part S will not only tend to loosen the same on the bolthut will also screw the same up on the collar 4J, which action will cause these parts to rotate as a unit.

JWhat is claimed isz* A nut lock comprising a collar, externally and internally threaded, the threads on the exterior of said collar-being run in opposition to those on the interior of the collar and of a less pitch, said collar` having an annular [lange dished on its under having an internal thread to correspond with the external thread on the collar and an internal thread ot a pitch greater than the first-mentioned threads and running in a direction opposite to said first-mentioned threads` said flange being; suliiciently rcsilientA lo flatten out under compression,

flu testimony whereof I affix my signature in presence ot' two witnesses.

ROBERT BIXBY.

Witnesses:

CIL-muss CHAPLIN 9 JosnrH SPENCER. 

